package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private CategoryMapper categoryMapper;

    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);
        //获取生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //向口味插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能删，是否存在其起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                //当前菜品处于起售中不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能删---菜品是否与套餐相关联
        List<Long> setmealIds = setmealDishMapper.getSetmealByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品处于套餐中不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品数据
/*        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除对应口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/
        //优化批量删除
        log.info("批量删除{}", ids);
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public DishVO getById(Long id) {
        Dish dish = dishMapper.getById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        //缺少categoryName flavors
        //根据菜品类型id查询类型名
        Category category = categoryMapper.getById(dish.getCategoryId());
        dishVO.setCategoryName(category.getName());
        //根据菜品id查询口味
        List<DishFlavor> list = dishFlavorMapper.getByDishId(id);
        dishVO.setFlavors(list);
        return dishVO;
    }

    /**
     * 根据dishId修改菜品信息与对应的口味信息
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //删除原有口味
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品起售或停售
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().status(status).id(id).build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId)
                .status(StatusConstant.ENABLE).build();
        return dishMapper.getByCategoryId(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.getByCategoryId(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
